Answer: Option B
Let the numbers be x, x + 2 and x + 4
Then,
$$\eqalign{
& \Leftrightarrow \frac{{x\left( {x + 2} \right)\left( {x + 4} \right)}}{8} = 720 \cr
& \Leftrightarrow x\left( {x + 2} \right)\left( {x + 4} \right) = 5760 \cr
& \therefore \sqrt x \times \sqrt {\left( {x + 2} \right)} \times \sqrt {\left( {x + 4} \right)} \cr
& = \sqrt {x\left( {x + 2} \right)\left( {x + 4} \right)} \cr
& = \sqrt {5760} \cr
& = 24\sqrt {10} \cr} $$